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Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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Dec. 31, 2014
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May 31, 2013
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May 31, 2004
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option terms |
10 years |
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| Weighted average remaining contractual life |
4 years 8 months 12 days |
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4 years 10 months 24 days |
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| Options exercised |
0 |
0 |
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| Stock options expense |
$ 1,000 |
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$ 1,000 |
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| 2013 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
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4,600,000 |
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| 2004 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
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2,500,000 |
| Shares issued |
0 |
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| Employee And Director Plan [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
2,700,000 |
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| Employee And Director Plan [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
4,350,000 |
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| 2000 Employee Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercisable time period |
5 years |
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| 2000 Employee Plan [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
2,500,000 |
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| 2000 Employee Plan [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
4,000,000 |
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| 2000 Director Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercisable time period |
1 year |
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| 2000 Director Plan [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
200,000 |
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| 2000 Director Plan [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
350,000 |
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